4-HYDROXYBENZOIC ACID | C7H6O3 | CID 135 ..
4-Hydroxybenzoic acid - American Chemical Society
Materials: p-Aminophenol, p-aminobenzoic acid 3-nitrophenol, 2-hydroxybenzoic acid, 2-chloroaniline, 3-methoxy-1-aminobenzene and resorcinol were purchased from BDH Chemical Company and Aldrich Chemical Company and used without further purification. All other chemicals used in the synthesis and characterization were of laboratory reagent and analytical grade.
4-hydroxybenzoic acid | Sigma-Aldrich
There is no sufficient information available as to how ASA influences weight change in plants or what effects it shows on their pigment and protein contents depending on concentrations. It was reported in a study by Shettel and Blake (1983) that SA and p-hydroxybenzoic acid application prevented growth of seedling and reduced dry weight increase in corn (L.), soy bean ( L.), oat (L.) and three wild plants. It was observed in barley plants germinated and grown in different salicylic acid concentrations that secondary leaf area increase and root development were prevented, while protein and chlorophyll (a+b) amount decreased parallel to concentration increase (Pancheva ., 1996). High concentrations of ASA were reported to inhibit root and coleoptile growth (Larque-Saavedra, 1978). In a study carried out with disks taken from primary leaves of one-week bean seedlings, chlorophyll a and b amount decreased parallel to the increase in ASA concentration, while carotenoid amount remained unchanged, but fresh weight loss and protein destruction increased (Çanakci, 2003). The fact that the effects of salicylic acid on plants vary depending on the type of plant, life period during application, concentration applied, manner and duration of application makes it difficult to explain the physiological effects of SA. This situation can be clarified only through a high number of research studies. As it is known, seed germination is a complicated process which aims at the mobilization of reserve substances and thereby includes various resulting hormonal modifications, gene induction and a high number of enzyme syntheses. We think that it is important to know whether SA, a new plant hormone, has any effect on this process which starts with swelling. Therefore, in this study, effects of different concentrations of ASA on germination, various growth parameters and chlorophyll (a+b) amount of cucumber ( L. Beit Alpha) were examined.